Milling machine



Jan. 14, 1930. J. M. MACRAE 1,743,150

MILLING MACHINE Filed Oct. 22, 1925 4 Shets-Sheet 1 Jan. 14, 1930. r J. M. MACRAE MILLING MACHINE Filed Oct. 22, 1925 E "II'IIIIII j &

Jan. 14, 1930. J. M. MACRAE 1,743,150

I MILLING MACHINE Filed Oct. 22, 1925 4 Sheets-Sheet 3 Jan. 14, 1930. J. M. MACRAE MILLING MACHINE Filed Oct. 22, 1925 4 Sheets-Sheet 4 Patented Jan. .14, 1930 umrao STATES PATENT OFFICE i. a CH N m. QMIAtifiAE, OFROCKFORD, ILLINoIs, ASSIG'NORTO THE INeERsoLL MACHINE COMPANY, or nocxronn, ILLINo s, A ORPORAT ON on ILLINoIs MILLING MAGHEINE Application filed October 22, 1925.:- Serial No. 64,098.

This invention relates to milling machines and more particularly is concerned with a sin-c gle spindle machine especially designed for milling the straight ends and the angular or v 5 tapered sides of safe doors and jambs and also the rounded corners thereof, although the machine is capable of a variety of other heavy duty uses that may involve practically universal manipulation of the spindle relative to the work, such as tilting, extensibilityand retractibility, adjustability of position on a ilinearly and on a radius relative to the work. 7

Briefly stated,the invention provides a mill- I ing machinecomprising a bed having a table movable back and 'forththereon and cross rails providingdguides for a pair of slides that support a cra 1e on trunnionsfortiltingmovement. The cradleflcarries a revolving saddle in which a spindle support is mounted ofi' center, the spindleitself rotating in bear 'ings in said support which are eccentric relative to the support, the spindle support being rotatable withnrespect to the revolving saddle for milling a small radius or adjusting the radius to be cut b revolving the saddle. J In addition to the ad]ustability of the spindle in the manner referred to, an upand down at jil stment' may be made relative to the wor when the spindle is vertical or tilted. :The: table is adjustable or fed lengthwise of the:

" bed and the cradle moves crosswise relative to thetable on; the cross raiis with the cradle slides that operate thereupon.

. The invention is more 'fullydescribed v I the followingspecificatien in which reference is .made'to the accompanying "drawings,

theproduction of a safe door such as that shown in :Fig. 19, the odd numbered figures representing plan views of the even numbered figures t Show the radius adjustment of the spindle while the even numbered figures show whether the spindle is vertical or tilted i I Fig. '19 is a rear view of a safe door ofthe type intended to be'produc'ed by the present machine having straight top and bottom endsand tapered sides;

Fig. 20 is a fragmentary end View of the door to show the tapering of the sides; and Fig. 21-is a sectionaldetail. of one end-of the door taken on the line 21+21 of" Fig. 19. Throughout the views the same reference numerals are applied to corresponding parts.-

' The milling machine illustrated is of par- 3 ticularly massive constructionand intended about 16 feettall, weighs about tons, and has a spindleelevation-relative to the table of 4 from, aboiit'lQ inches to 60 inches. is imme'nse size has, of conrse,-imposed certain restrictions upon the design of certain features O'fthemachine. .Howevei, it will be understood the invention is applicable to machines of different types and sizes whenthe proper accommodations areni'ade. The invention therefore, limited only: as necesg sitat'edby the state of the prior "art.

comprises a bed ihaving' ways 2 for-a table 3 movable backfand forth i. thereon. "Two pairs of polumnstare suitably fastened to the bed and dow'eled'to; insure permanency of alignment. -The columns 4'support a air g Y of cross rails 5, The railsjd jare finishe ion the top and inside 'faces thereof to provide 7 we for slides Grnovable crosswise relative to the table 3 for feeding or adjusting the 'positionof cutter-supporting spindle 7. A

. As illustrated-in the drawing,-the-machine f cradle 8 is tiltable with respect-to the slides or carriages 6 on trunnions 9 received in bearings v10-0n the slides. The cradle is capable of tilting in either direction to the'extent of about 20 to the vertical although of course the precisedegree of tilt to 'be provided for may vary according to the kmd of work 1 it is desired to perform, 'The cradle -8-'car-.

rice a revolving saddle 11 which in turn provides a mounting for a spindle support 12. The spindle support is off center relative to the saddle 11 as illustrated and the spindle 7 is rotatable in bearings 13 in the support 12 which are eccentrically arranged. The description thus far is intended only to give a general understanding or perspective of the invention.

It will be seen that the'work clamped on the table 3, as for example a safe door or jamb, may be advanced to the spindle and fed with respect thereto in the milling off of a side of the door or jamb. In the. present instance the spindle will be inclined to the vertical in the milling of either side of the door or jamb. In milling either end of the work the spindle is fed crosswise v with respect to the table and will of course make a vertical' .=ut. The spindle is disposed I is set at the proper radius by the adjustmentof the support 12 and the spindle is fed in an are by the revolving of the saddle 11. A vertical cut on a radius may be made in this way where the spindle remains vertically disposed. In the present case, however, the spindle istilted so that a taper cut on a radius is made. Obviously, the tilting of the spindle will not affect the vertical cut made on the ends of the work. In tilting the spindle it is, however, necessary to jog it up ordown, as the case maybe, to maintain the same elevation of the end of the cutter relative to the table or the work thereon. This vertical adjustment is secured by a screw. 1 L operating in a nut, 15 which in turn provides any ordinary type of thrust bearings 16 for rotatably receiving the upper .end of the spindle 7 on the nut 15 so that the spindle will move endwise with the nut when the latter is adjusted on the screw.

The table 3 and the cradle slides 6 are suitably capable of handand power adjustment. At 17 is illustrated a pulley which drives suitable gearing in a housing 18 for transmitting niotion to a stand shaft 19 to drive the two feed screws 20 whena clutch controlled by a hand lever 21 is properly engaged. The two srrews are geared together in any suitable manner so as to operate in unison. There is also an operating connection extending from the housing 18 through the housing 22 for o erating the table 3. The feed of either the table 3 or the slides 6- is reversible. It

-will not be necessary to illustrate or describe the hand adjustments provided for these parts as they are well known tothe art. Separate sources of motive power are provided for the tilting of the cradle, for revolving the saddle, for adjusting the spindle support, and

It will suffice for the present saddle ll in the cradle and a separate motor 1 25 is provided for setting the spindle support 12 to the desired operating radius for the spindle 7. The spindle is'driven by a motor 26 and has its up and down adjustment secured by a. motor 27. Due tothe number of motors employed and because of the char-v acter of work performed, it becomes important to make some convenient PI'OVlSIOH for the mounting of the switch keys for controlling said motors, and, while the same may take various forms, it is contemplated to provide banks of switch keys on a portable carrier similar to an annunciator push-button block. which the operator or operators of the machine may carry about in controlling the movements and setting of the machine, the carrier having flexible cable connections permitting movement of the operator from one part of the machine to another or round and about the same for observation of the work from all angles. The motor 23, which tilts the motors 26 and 27 are supported on brackets 31 and 32 respectively, provided on the platform 33 mounted on the spindle support 12. In this way. the motor 25 tilts with the the cradle 8, is preferably mounted on a cradle and .revolves with the saddle. while the motors 26 and 27 not only tilt with the cradle and revolve with the saddle.'but also revolve with the spindle support, The foregoing will sulfice to give a basis for an easier understanding of the more specific description of the structure and operation of the machine that follows.

Cradle tiltiag means M The motor 23 has a worm on its armature shaft 34 meshing with a worm gear inside the housing 35. has a worm on the shaft thereofiinside the The last, mentioned. .gear 1 I u n 0 houslng extenslon 36 meshing with a worm gear in the housing 37 for driving a worm' use that the cradle ma spect to the work on the table.

' Spindle support operating mesa/Fileproper switch key to set the motor 23 in operation. When the desired'tilt'is secured,

which the operator "will note by the 'movementof'an index on the cradle relative to a scale preferably-on the cradle slide, he

will shut off the motor by depressing another key associated with the first key in his portable control set. 'A suitable hand adjustment (not shown) may also be provided if desired for the cradle to enable, or at least facilitate, more accurate setting of the tilt' of the cradle. The bolts 40, asillu strated are provided for clamping'the cradle in its adjusted position. The motor 23'is reversible be tilted in either direction as desired an can be brought back to its normal vertical position from a tilted position.

Saddle re vohing mam The motor'24, as stated above, is supported on a bracket 29 secured .to one of the trunnions 9'-so as to tilt with the cradle. The bracket'29 provides bearings for the armature shaft 41 on, which a gear, 42 is fixed to drive a gear 43 on a countersha'ft 44. A bevel .gear 45 on the shaft 44 meshes with another bevel gear 46 for driving a worm within the housing 47. The last mentioned worni'drives .30 a worm gear within the housing ,48. to drive the shaft-49 extending from the housing 48 to a'honsing 50 mounted on top of the cradle, 8as illustrated. A bevel gear 51 on the shaft 49 inside'thellousing 50 meshes with another bevel gear 52 to drive a worm 53 meshing with the worm .ring gear 54 bolted on top of the saddle 11 as indicated. The saddle 11 is of hollow cylindrical form, as illustrated, with a reduced lower end 55defined 40- by an annular shoulder 56resting on a hearing 57. -A top tapered bearing-58 and a bottom tapered bearing 59 serve as further supports for the saddle 11 within the cradle 8 and permit of adjustment for taking. up

wear. The motor 24 is preferably a constant speed, reversible motor and is arranged .for'

control similarly to the motor 23 to adjust or feed the revolving saddle. The spindle 7 when set to the proper radius, as will'presently be described, is

. The motor 25 has a gear 60 on the arma-.

ture shaft thereof, meshing with a gear 61' for driving a worm 62. This worm meshes I with a worm gear 63 to ,drive the shaft 64 received invbearings in the saddle 11. A

bevel gear 65 on the shaft 64 meshes with another bevel gear 66 on a stand. shaft 67-, also J bevel ring gear 72 fixed to the spindle support 12. The spindle support, it will be noted,1s of a hollow, "cylindrical form and is arranged off center with respect to the saddle- 11. The reduction of the lower end 73 of the spindle support provides an annular shoulder at 74 on which the ring gear 72 is secured. The spindle support is received in an upper bearing 75 and a lower bearing 76 in the saddle 11. The bearings 13 provided in the support 12 and on a depending portion of the platform 33 are arranged eccentrically with respect to the spindle support sufiiciently so that it is possible to arrange the spindle 7 at the exact center of the revolving saddle 11. 1

In Fig. 2, the spindle is shown ata position of maximum radius relative to the center of the saddle. Any variation in radius desired from this maximum radius is obtainable by the rotation of the spindle support. The motor 25 is preferably aconstant speed, reversible motor to facilitate adjustment of the spindle to'the desired point. Manual means (not shown) may be provided if desired for rotating the spindle support by hand to permit, or at least facilitate, accurate adjustment of the operat' radius of the spindle. Obviously, it is possi le to oper-' ate the spindle in a circle by revolving the spindle support while the saddle 11 is stationary. With the combination of the saddle 11 and spindle support 12, it is possible to mill any desired radius within the limits of the machine, the present machlne affording a range of. from zero to 18 inches. The splndle support is suitably graduated in any well known manner to denote the eccentricity of the spindle with respect to the saddle in inches. It is hardly necessary to state that" the operations just referred to are unaffected bycthe tilting of the cradle.

- Spindle drive The motor 26 on the bracket 31 is coupled with a worm 77 driving a worni gearon the shaft 78 on which shaft a sprocket 79'is also provided. This sprocket has driving connection with another sprocket 80 through the chain connection indicated to driv'e a.

worm 81 which in turn drives the jack shaft 82 through the medium of the worm ear 83.

"I The gear 84'on the, shaft 82 drives t e gear 85 on the spindle 7 The 'gear 85 has a splined connectionwith the spindle 7 to permit adju'stnient of the latter up and down relative to the work, as will presently appear. The motor 26 for driving the spindle is preferably of a variable speed type allowing a range of from about 500 to 1500 R.

. The controlling of the motor speeds may, of

course, be taken care of bythe operator with 7. his control set.

type and is rotatably supported, as above described, in thrust bearings 16 in a lateral eX- tension off the nut 15 which has the screw 14 threading therein. The screw 14 is received in a bearing 86 on the top of the platform 33 and is driven by a worm gear in the housing 87 at its upper end. A worm in the housing extension 88 drives the worm gear and is in turn driven from a stand shaft 89 through a pair of meshing bevel pinions in the housing 90. The shaft 89 is driven by a worm gear in the housing 91 meshing witha worm driven by the gear 92 meshingwith the gear,93 on the armature shaft of the motor 27. The weight of the spindle is counterbalanced bya counterweight 94 having cables 95 passing over sheaves 96 ahd attached to the nut 15 as indicated at 97. The motor 27 is preferablyof av variable speed, reversible type permitting the jogging up and down of the spindle at different speeds as desired. The up and down adjustment of the spindle relative to the work on the table is required for the operation on the different steps on the sides or ends of a safe door, for example. The adjustment is also required to keep the same elevation of the end of the spindle relative to the work when the spindle is tilted from a vertical position.

Operation In describing the operation of the machine, reference may be had to'a specific class of work for which the machine was designed. For example, in Figs. 1921 a safe door 98 is illustrated having straight top and bottom ends 99 and tapered sides 100, both the straight and the tapered sides being stepped, as shown in Figs. 20 and. 21. The jamb for the door will, of course, be of a complementary or converse formation for obvious reasons. In Figs; 3-18 all of the positions of tbespindle, spindle support and revolving saddle required in'the production of a' safe door such as that just described are illustrated.- Assuming that a rough castin of the door isclamped upon the table 3 an brought up to position alongside the spindle 7 to have one of thesteps machined about the four sides of the door, one of the ends 99 will be presented to the cutter on the spindle 7.

The spindle starting from one corner at the end of the door from the station A is fed across the end crosswise of the table to the station B by feeding the cradle 8 with the of the machine.

tion are shown diagrammatically in Figs. 3 and 4. At the station B, the cradle 8 is tilted to tilt the spindle 7 as indicated in Fig. 6, the parts, being left otherwise in their same respective positions except for an extension of the spindle to keep the lower end thereof at the same elevation as before, this constant elevation being represented by a dotted line' in the drawing. With the spindle tilted the saddle 11 is revolved through an arc of 90 to the station 0, thus providing a rounded cornerwith a vertical face on the end 99 merging into a tapered face on the side 100.

.righted, as indicated in Figs. 11 and 12, and

is then fed crosswise of the table to the.station F to mill off the lower end 99. At F the spindle is again tilted, as indicated in Fig. 14:, and is fed in an are. as shown in Figs. 15 and 16, to thestation G. In all of the steps referred to, the proper accommodation of the elevation of the lower end of the spindle is made to keepapproximately on the dotted line shown in the drawing to represent this elevation. The table 3 is fed back with the spindle in the position shown in Fig. 16 until-the station H is reached. Here again the saddle 11 is revolved through 90 in going from the station H to the station A. This last manipulation is represented in Figs. 17 and 18. It isob'vious that the milling opera-- tions described will make square finished shoulders to define the edges atonly the ends of the door. The continuation of these square shoulders from B to E and from F to A may be performed by using the spindle in a vertical position, to rout off any materialleft because of the fact that between these points the spindle was inclined in the firstoperation. The foregoing will suffice to give. a fairly clear understanding of the operation It will be understood. of course, that the machine is capable of many other kinds of work that may involve similar complicatedmanipulations of the spindle. such as tilting, extensibility and retractibility, adjustability of position on a rotary a radius relative to the work.

I claim: Y

, 1. Inamilling machine the combination of a work support, a rotary spindle, a tiltable.

cradle for mounting said spindle, and a rotary saddle in said cradle for supporting said spindle and revolving relative to said cradle.

2. Ina milling machinethe combination of a work support, a rotary spindle, a tilti the same in an orbit able cradle for mountingfsaid spindle, a rdtary saddle in said cradle for'supportingsa'id spindle and revolving the same in an orbit,

relative to said'cradle, and means for adjust,

ing said spindle in and out relative to said bearing said spindle and arranged eccentrisaddle in said cradle, and a spindle supportcally-with respect to saidsaddla 4. In a milling machine, the' combination of a work support, a rotary'spindle, aftiltable cradle for mounting the same, a revolving bearing said spindle and arranged eccentrically with'respect to said saddle, said s indle support being rotatable relativeto sai saddle and havi'n respect to itsel said spindle eccentric with spindle carriedflthereby, motive means for tiltingsaid cradle relative to said carriage cradle.'- p M '10. In amilling machine, the combination with a work support, of, a rotary spindle; a

carriage therefor, a tilting cradle for mounting said spindle on said carriage, a rotary saddle mounted in the cradle and having means thereon for adjustably supporting the spindle whereby said spindle is arranged to be positioned centrally or eccentrically with respect thereto, motive-means for tilting said "cradle relative to said carriagemounted on said carriage, motive means for driving said spindle supported by said cradle, and means for adjusting said spindle in andout relative to said cradle'supported by said cradle.

11.;Inamilling machine, the combination,

' 5. In" a millingmachine, the combination/ with a work support, of a rotary spindle, a of a work suppdrt, a rotaryspindle, a tiltable with respect to said 'justing said spindle in and out relative to cradle for mounting the same, a revolving saddle in'said cradle, a spindle support hearing said spindle and-arranged eccentrically saddle, a'ndmeans for adsaid support. 1 I

T of a work support, a rotary spindle, a tiltable p 6. In a millingmachine, the combination I cradle for mounting the same, a revolving saddle insaid cradle, and a-splndle support "bearing saidspindle and arranged eccentrisupport bein-grotatable relative to said-sadcally with respect to said saddle, said spindle dle and having saidspindle eccentric with respecttpits'el'fgand meansforadjusting said spindle in'and out relative togsaid support.

- 7. In a milling machine, abed, a table moving-thereon, cross. rails oversaid bed and table, -a cradle slide moving thereon crosswiserelative to said table, a cradle supported by trunnions on said slide for tilting relative to saidtable, a saddle-rotatably mounted on ,fsaid cradle, a spindle support 'rotatablymounted onsa-id saddle and arranged eccen- I *tric, relative. thereto, and arotary spindle mounted eccentrically in said support.

8. In'amilling machine, a bed, a table moving thereon, crossvrails over. said bed and table, a cradle slide moving thereon crosswise relative to'sa'id table, a cradle" supported by trunnions on said slide, for tilting relative to cradl, a spindle support rptatably mounted said table, fa saddle rotatably mounted on'said on said saddle and arranged eccentric rem-i tive thereto, and a rotary spindle mounted eccentrically in said support and adjustabl'er' len thwise'relative thereto toward and away 7 l v with a work support, of a rotary spindle, a

w from said table.

9. In a milling machine, the combination "with a work support, ofa rotary spindle, a

, carriage therefor, a tilting cradle for mountmeans on sai *said spmdle.

carriage therefor, a tilting cradle supported by said ,carriage, a revolving saddle in said cradle bearing said spindle eccentrically rela'-. tive thereto, motive means for tilting said cradle relative, to said carriage mounted on said carriage, motive means for revolving said saddle relative to said cradle and-mounted on said cradle, and motive means for driving saidjspindle supported by saids'addle,

saddle mounted the cradle and having the 12. In a milling machine, thecombination with a work support, of a rotaryspindle, a carriage therefor, a tilting cradle supported by said carriage, a revolving saddle 1n the cradle bearing said spindle eccentrically rela-' carriage therefor, a tilting cradle supported by said carriage, motive means for tiltingsaid cradle with respect to said carriage mounted on said carriage, a revoluble saddle in-said cradle, motive means for revolving said saddle with respect to said cradleimounted on said cradle, a spindle support mounted off center in said saddle for rotation therein,"

motive means on said. saddle forlturning said spindle support relative thereto, and motive spindle support for driving 14. a In a milling machine, the combination carriage therefor, a tilting cradlesupported mounted. on said carriagqa revoluble saddle 5 in said cradle, motive means for revolving said saddle with respect to sa1d cradle mounted on said cradle, a spindle support mounted reciprocable on ways provided on said frame to move crosswise with respect to'said table whereby to perform cutting operations on the work along one dimension thereof, and a cradle pivoted on a horizontal axis that is always parallel to the direction of movement of the table for tiltably mounting said spindle on said slide whereby to dispose the cutter at an angle to its normal in either direction, said table being arranged to move to feed the work relative to the spindle in its inclined positions whereby to perform cutting operations on the work along another dimension.

I 16. In a milling machine, aframe, a table reciprocable on ways thereon for carrying work back and forth to be operated upon, a rotary spindle arranged to carry a cutter to operateoif the work, a slide for supporting said spindle reciprocable on ways provided on said frame in transverse relation to the aforementioned ways whereby the spindle may be brought to any position toward either side of thetable and may be fed crosswise with respect to the table so that cutting operations may be performed on the work along one dimension, a,cradle plvoted on a hor1zontal axis that is always parallel to the direction of movement of the table, and means for mounting said spindle on said cradle to move I on a radius in an arc whereby to form rounded corners on the work, said table being ar-' ranged to move to feed the work with respect to the spindle whereby to perform a cutting operation along another dimension thereof.

17. In a milling machine, a frame providlng ways thereon, a table reciprocable on said Ways to carry work back and forth to be operated upon, a rotary spindle arranged to carry a cutter to operate on the work, a slide fo supporting said spindle operating on ways provided on said frame transversely with respect to the aforementioned ways, the work being operatedupon along one dimens1on by movement of said table relative to the spindle and .along another dimension by movement of said spindle with its slide relative to the table in a transverse direction, a cradle for tiltably mounting said spindle relmalaise ative to said slide to incline the cutter relative to a normal whereby to produce bevel cuts on the work, and a rotary support on said cradle for said spindle whereby the spindle is arranged to be moved in an are relative to said slide about a vertical axis or an inclined axis depending on the position of the cradle to produce arcuate cuts on the work as, for example, in rounding corners.

18. In a machine as set forth in claim 17, the provision of means for adjusting said spindle endwise relative to said carriageto bring the lower end of said spindle to a desired spaced relation relative to the table or to maintain a predetermined spaced relation regardless of an inclination of the spindle from a normal.

19. In a milling machine, a bed, a table reciprocable thereon, a support, a slide movable thereon crosswise with respect to the table, a cradle tiltably mounted on the slide and disposed over the bed and table, a saddle rotatably mounted on the cradle, a spindle support rotatable on the saddle eccentric with respect thereto, and a rotary spindle mounted eccentric-ally in the spindle support.

20. .A milling machine as set forth in claim 19 wherein the rotary spindle is adjustable lengthwise relative to the spindle support toward and away from the table.

21. In a milling'machine, a frame, a table reciprocable on ways thereon to carry work back and forth to be operated upon, a rotary spindle arranged to carry a cutter to operate on the work, and means for supporting the spindle above the table permitting the tilting thereof whereby to dispose the cutter at an angle to its normal position in either direction, said table being arranged to move to feed the work relative to the spindle in its normal or inclined positions whereby to perform cutting operations thereon, and permitting the movement of the spindle on a radius 'in an arc whereby to form rounded corners on the work wlth the spindle either in a normal or inclined position.

' In witness of the foregoing I aflix my signature.

JOHN M. MACRAE. 

